Loud-speaking transmitter.



Cf BGERTON.

LOUD SPEAKING TRANSMITTERl APPLICATION FILED OCT.1`|,19`1] cach adapted to receive metal button or vCylinder '28. Each 'l these cylinders 28 'ias a chamberedportion 29 adapled to re ceive. an electrode preferably of carbon attached to a metal stein or post 3l eX- tending through an opening through said cylinder and screw-threaded on its and to receive nuts 3Q and :KB lor clamping said electrode 30 in place and for attachment oi" a terminal. llach olectioiile and stein is iusulated from the walls of the cj-,iliiider 28 by means of an insulating bushing 254.-. Secured to the 'face oi: the iylinder Z8 a flexible metal electiiode lo preferably ot lL carat gold as suchI metal has been round to be moet clicient and resiionsive when operated in connection with the da phragin. The electrmile Si is ured to the Jrace of the cylinder 2S by means oiI a screwthreadcd ring 36 .which engages screw threads on the periphery of sail cylinder. Attached to one of said inetal olecti'oc 35 is a screw-threaded stud `rlo vil 'fn when the metal cylinders Q8, are in place is adapted to pass through an opening f the end of the arm Ll of the lever iid eii. gage an interlorly screw-threaded extension 42 on the other oi said electrodes, thereby securing said electrodes together and to the lever arm 14;. Set screws 11:23, a3, extending through the Walls or the lugs 26, 2o, engage said cylinders QS, 28, to retain them in place. A resistance varying medium 45 such as comininuted carbon is placed in the chambers 29, 2), between the fixed and inovable electrodes. The cylinders 28, 28, and lugs 26, 26, are made with plenty ot metal in order that there will be a large surface for conducting the heat -away from the Ichambers 22), 2%), generated by heavy currents.

Additional means such as radiating plates may be supplied for conducting away the heat' oi' the transmitter may be arranged for Water eooling. in the (linfa/ings the v tter arrangement shrevn and ce' sists in providing in the lugs Q 2o channels 50, 5G, vwhich surround She cylinders and are ci'innectcd with @zich other by moans oi: other channels oi' pipes 5l, 5l, through the web portion which in lrn may be connected with inlet and outlet pipes and oiz a suitable water supplyr Screwthreaded retaining rii 5l, 5i, are secured to said lugs to retain watertight coverings 55, 55, over said channels 50.

-l near p animas The base plate 5 and the web 15 are secured together by means of nuts and bolts (30, 60, extending through insulating bushings (il, (il, material not susceptible to'temperature or weather changes. )l cover 62 is provided for the lower part of the apparatus which slipped on Yfrom the bottom and secured to the plate A .circular plate .65 having an offset portion GG therein to permit moveinout of the arm i3 is secured to the back of the mounting ring 6.

By using a glass diaphragm, been found to reproduce more faithfully than any other material all 'of the .tones oli the human voice, in combination With the electrodes of soft metal which have Very i little` it anyelasticity, the elasticity of all of the parts except of the diaphragm may heeliniinated so that the diaphragm alone will take care of all of the vibrations Without being inliucnccd by counter vibrations'of the electrodes or other movable parts. It has been 'found that by this means a very much hotter reproduction of the voice currents obtained and particularly of the overtones oi 'the voice.

l claim:

i. ln a telephone transmitter, the combination with a glass diaphragm of carbon containing chambers, soft metal electrodes tor said chambers responsive t0 the vibrations of said glass diaphragm and means for reducing the amplitude of the vibrations of said metal electrodes With respect to the amplitude of vibrations of said glass diaphragm.

which has esl 2. The combination with a supporting' base having an opening therethrough of a transmitter' diaphragm mounted thereon, rigidly supported carbon containing chainbers carried by said base, laterally separated niovable electrodes in said chambers rigidly connected together, and a lever arm for connecting said diaphragm and said electrodes, said lever arm being pivotally supported Aupon said base and extending through the opening therein.

3. The combination with a supporting base of a transmitter diaphragm mounted thin-con, carbon granule containers carried by said base, movable electrodes in said containers, a "lever arm eonnectingsaid electrodes with said diaphragm, pivotal members tor said lever arm carried by'said base and Flexible supporting members attaching said lever arm to said base.-

i, ,lhe combination 'with a supporting base oit a, transmitter diaphragmmounted thereon carbon granule eontiiiiners,'movable ele ,t-rodes in said containers, a lever arm` connecting said electrodes with said diaijihragm, pivotal supporting members for said lever arm carried by said base and lietiible supporting members attached at one end `tended in opposite vers, and with each other and with one end of said to said lever arm, said members being eX- direetio'ns from said lever arm and having theirou'ter ends attached to said base.

5. The

combination with a supporting base having anopening therein of a transmitteriaphragm mounted thereon, carbon supporting means for therein in alinement with having one end connected With said diaphragm, movable electrodes in said containmeans for connecting said electrodes lever arm.A y

A 6. The combination -with a supporting base havin an opening therein, of a transmitter diap bon granule containers, rigid supporting means forl saidcontainers attached to said base and having an openingrtherein, a piv- I 1 otally supported lever having arms of dif-` ferent lengths extending through .said openings the longer of said arms being attached ragm mounted in said base, car-A to said diaphragm, said shorter arm being provided with an opening .near one end thereof, movable electrodes supported in said containers, a screw threaded pin n one of said electrodes passing through the opening in said arm and Aan interiorly screw threaded portion carried by the other of'said electrodes'to receive said pin.

7. The combination with a supporting base of a transmitter diaphragm mounted thereon laterally separated supporting lugs carried by said base and having alined openings therein, a metal cylinder adapted to be secured in each of said openings and having a chamber therein, movable and stationary electrodes carried by each of said cylinders and means for connecting said electrodes with `said diaphragm.

In Witness whereof, I, hereunto Subscribe my name this 18th day of October, A. D.,l 1911.

HENRY C. EGERTON.

Witnesses L. Maman,

F. P. McINTosH. 

